Can we add this to an existing reef with slightly elevated ammonia?

If by existing you mean live stock in it? Yes, and if you mean no stock but ammonia, yes again. You might be better off doing a water change if you have life in tank though. If you dose this you will have to monitor nitrite and nitrate cycles.

Im new...will this kill off my invert food sources or hurt them in any way?

It will not kill your invert food source. It’s bacteria that’s beneficial to your aquarium

Noob question how much of this do I use on a 32 gallon biocube? It’s a new tank I can’t find any measuring cups for ML anywhere n my town

Once your tank has been fed regularly for a few days either with out without fish to start the bacterial cycle, add half during the first week and the other half during the 2nd. Add a small amount after water changes is also a good idea for upkeep. Buy 2 bottles.

how long did it take for this product to bring down nitrite levels?

I wouldn't use this product as a means of nitrite reduction. Live rock will do a much better job of that. I use this product as a means of adding biodiversity to my tank. It did nothing for nitrate levels.

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Brightwell Aquatics MicroBacter7 Biological Filter Bioculture Aid, 4L

Product ID: 201406281

Details

Brand
Brightwell
Item Form
Liquid
Item Weight
7.7 pounds
Liquid Volume
4 liters
Unit Count
1 Count

💧4L liquid volume for long-lasting aquarium care

🦠7+ microbial strains for superior filtration

🇺🇸Made in USA with premium quality standards

€ 259.67

Duties & taxes included

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Description

🦠 Elevate your aquarium’s ecosystem with microbial mastery!

MICROBIAL POWERHOUSE - Harness a complex blend of aerobic & anaerobic bacteria to turbocharge your aquarium’s natural filtration.
DUAL ECOSYSTEM SUPPORT - Perfectly engineered for both freshwater and marine tanks, ensuring versatile, all-in-one water clarity.
RAPID NUTRIENT CYCLING - Accelerates nitrification and denitrification to keep ammonia, nitrite, and nitrate levels in check—goodbye toxic buildup!
ORGANIC WASTE BREAKDOWN - Effectively degrades organic matter and limits phosphate availability, preventing algae blooms and sludge.
TRUSTED AMERICAN CRAFTSMANSHIP - Scientifically backed, veterinarian recommended, and proudly made in the USA for unmatched reliability.

Brightwell Aquatics MicroBacter7 is a 4-liter advanced microbial bioculture designed to optimize aquarium water quality by accelerating nutrient cycling and organic waste degradation. Suitable for both freshwater and marine tanks, it reduces harmful compounds like ammonia, nitrite, nitrate, phosphate, and hydrogen sulfide, promoting a cleaner, healthier aquatic environment. Made in the USA and veterinarian recommended, it’s the go-to solution for professional-grade aquarium filtration and clarity.

Specifications

ASIN	B0849W1V96
ASIN	B0849W1V96
Allergen Information	Sulphites Free
Best Sellers Rank	#5,813 in Pet Supplies ( See Top 100 in Pet Supplies ) #123 in Aquarium Filter Accessories
Brand Name	Brightwell Aquatics
Customer Reviews	4.7 4.7 out of 5 stars (3,500)
Date First Available	January 29, 2020
Included Components	MicroBacter7
Item Form	Liquid
Item Type Name	Aquarium Bacteria
Item Weight	7.7 pounds
Item model number	BAC4L
Liquid Volume	4 liters
Manufacturer	Brightwell Aquatics
Manufacturer	Brightwell Aquatics
Manufacturer Part Number	BAC4L
Model Number	BAC4L
Package Dimensions	12.36 x 8.46 x 6.69 inches; 7.65 pounds
Pet Type	Fish
Target Species	Fish
UPC	810086017782
Unit Count	1 Count

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